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In my experience this very much depends on the dog's preferred sleeping style.
For example, Battendog loves to spread out shamelessly - he needs a bed that is at least 1.5 times his full body length so there is enough space to stretch out his legs. He also likes a pillow so the edges of the bed need to be soft and pillow-like otherwise he will make a pillow inside the bed with blankets - thus meaning it needs to be even bigger.
A friend of mine has a german shepherd who
a) is massive (and)
b) loves to curl up tight into a ball
She will not sleep in a bed bigger than about 50cm across, even though it looks super uncomfortable to me
Does yours like to curl up tight in a ball or stretch out, do you think?
good point . When i get up in the morning he seems to be in a very tight ball in his bed and also does this when hes on my knee sometimes , tucks his head right in . But , he also sleeps on the living room rug stretched out . If only he could talk i'd ask him !